Furnace



(No Model.)

E. F. EDGAR.

PURNACE.

Patented July 5, 1892.

l my UNTTED STATES PATENT @einem ELLIS F. EDGAR, OF WOODBRIDGE, NEIV JERSEY.

FU RNACE.

SPECIFICATION forming part of Letters ltatent No.v 478,319, dated July 5, 1892. Application filed October 10,*1891. Serial No. 408,342. (No model.)

To all whom t may concern.-

Be it known that I, ELLIS F. EDGAR, a citizen of the United States, and a resident of Woodbridge, in the county of Middlesex and State of New Jersey, have invented a certain new and useful Furnace, of which the following is a specification, reference being had to the accompanying drawing, forming part of the same, in which thev figure is a central vertical sectional view of a shell-boiler built to illustrate my invention.

The object of my invention is'to utilize the beneficial features of an upright boiler as to simplicity of construction and economy of maintenance, avoiding the more rapid deterioration of some parts than others (especially the crown-sheet) if directly exposed to the action of the flame, which would greatly limit the life of the apparatus, and yet avoiding it in such a way as will not entail the loss of power ordinarily attendant upon the use of apparatus devised to sustain the extreme heat necessary to rapid steaming; and it consists, mainly, in the protection 0f the crown-sheet by a wall to be described, by the use of which I am enabled to produce a very effective yet simple apparatus-a mere shell of great steaming capacity and great endurance.

A is the boiler. It consists of the interior shell S, exterior shellS, grate G, 'ash-pitI, doors D and D', draft-exit E, a crown-sheet connecting the inner shell and the lower end of the wall of the draft-exit, and a dome-cover (if it may be so called) connecting the exte` rior shell and the upper endl of the draft-exit. Between the crown-sheet and the dome-cover is a steam-space.

Heretofore when building upright boilers makers have considered it necessary to have water over the crown-sheet orto have a series of tubes fill the upper end of the tire-box, through which the heat-currents in divided portions should pass onward. I have discovered that this is unnecessary, and that with the steam-space and parts arranged as described I can attain satisfactory results, particularly if I protect the inner face of the crown-sheet from the direct action of the great body of flame and consuming fuel by means of a wall, such as W', which may be of fire clay or other incombustible material. As shown, this wall is some distance below the crown-sheet; but it may be arranged much closer to it. Such a.boiler is quite effective, and, as I believe, much more so than would be a horizontal one of equal surface, for the reason that the ascending atoms stopped in part produce a variety of molecular bombardment,so termed, of much greater eficiency than would be the case if said atoms were compelled to move in a horizontal direction before being exhausted of their heat- -units, or substantia-lly so, and, as will be n0- ticed, the work of such atoms is substantially done in this boiler before they reach or by the time they reach the draft-exit in the interposed wall. I have also introduced another wall W, which, if alone, might to some extent perform the oifice of wall W and protect the crown-sheet, but is here especially used to check the ascending atoms, assist to cause the molecular bombardment, and insure that the interior wall of the shell shall receive that direct action of the burning fuel that it might otherwise fail to receive if the draft were wholly toward the center of the boiler instead of, ,as here, to the wall of the shell and edge of W, this being secured by leaving an aperture or apertures between said wall and the shell, usually about equal in cross area to the cross area of the draft-exit. Indeed, the combination of these two plates or walls is Vespecially useful for the purposes of protection, for it will be noticed that if the lower one W were used alone the ascending currents upon passing through the apertures left would to some extent impinge upon the crown-sheet, and though then bereft of much of their heat would still heat that sheet to a higher degree than I desire, while if sheet IV is also employed this becomes impossible, and I at the same time secure the benefits arising from the use of a plate with apertures at-its side edges. I prefer to use bothV plates, especially for hard coal. For straw one might do, and fair results are attained with the boiler alone, its life, however, being not so long as when the crown-sheet is protected. The water is usually kept at about the level of the protecting-plate, and when so operated steam is generated very rapidly and very economically.

E is an air-feed I sometimes combine with this boiler and operate with or without a blower, as shown, or with a jet of steam iutrodueed through the pipe shown at the bottom of Fig. 2; but, as I here make no claim for this feature, Ishall omit extended description.

That I claim as my invention isl. An upright shell steam-boiler having an interior shell, an exterior shell, a draft-exit, a steam-space, and a crown-sheet, Substantially as set forth, protected by a Wall WV', arranged, as described, from the direct action of the ila-lne, all substantially as set forth.

2. An upright shell steam-boiler having an interior shell, an exterior shell, a draft-exit, a steam-space, a crown-sheet, a Wall located near the upper end of the {ire-box, with an aperture or apertures therethrough at or near its extremity about equal in cross area to the cross area of the draft-exit, and a second Wall beyond the rst, provided with an aperture about equal to or a little less in area than the aperture in the first Wall, but located out of line with the apertures in said iirst Wall, one or both of Which Walls are arranged, substantially as set forth, to protect the crown-sheet of the boiler, all substantially as set forth.

Signed at Neur York, in the county of New York and State of New York, this 9th day of October, A. D. 1891.

E. F. EDGAR.

Witnesses:

JAMES M. GUMINGS, JAMES E. LYON. 

